CVE-2026-91165

Description

Warpgate is an open source SSH, HTTPS and MySQL bastion host for Linux. Prior to 0.27.6, the response_mode=form_post SSO return path in warpgate-protocol-http/src/api/sso_provider_list.rs uses serde_json::to_string inside ReturnToSsoPostResponse without neutralizing a script-closing sequence. The vulnerable value can enter the script block through the attacker-controlled next redirect parameter stored by warpgate-protocol-http/src/api/sso_provider_detail.rs or through IdP-derived error messages that make_redirect_url concatenates without URL encoding. The IdP-derived path is reachable when the attacker controls a configured identity provider, or when the attacker controls the email or username claim on an attacker-controlled account and the configured identity provider permits the required unvalidated claim format. A victim must complete the form_post SSO flow for the injected markup to be rendered. The Warpgate Content-Security-Policy blocks injected JavaScript and event handlers, so the demonstrated impact is content spoofing, a false login form, or a meta refresh rather than script execution. This issue is fixed in version 0.27.6.

Overview

State: PUBLISHED
Assigner (CNA): GitHub_M
CVSS severity: LOW
CVSS score: 2.4 / 10
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N
Effective score: 2.4 / 10 LOW source: CNA overview
CWE(s): CWE-79
Reserved: 2026-09-14
Published: 2026-09-21 18:53 UTC
Last updated: 2026-09-21 19:26 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/91xxx/CVE-2026-91165.json

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-09-21 19:17:15 UTC
NVD last modified: 2026-09-21 20:17:39 UTC
NVD CVSS v3.1: 2.4 / 10 LOW source: security-advisories@github.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N
Exploitability subscore: 0.9 / 10
Impact subscore: 1.4 / 10

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-84063
Assigner: GitHub_M
Published: Sep 21, 2026, 6:53:03 PM
Updated: Sep 21, 2026, 7:26:22 PM
EUVD base score (CVSS 3.1): 2.4 / 10
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N
EUVD-reported EPSS: 0.0000
Vendors: warp-tech
Products: warpgate (< 0.27.6)

ENISA description: Warpgate is an open source SSH, HTTPS and MySQL bastion host for Linux. Prior to 0.27.6, the response_mode=form_post SSO return path in warpgate-protocol-http/src/api/sso_provider_list.rs uses serde_json::to_string inside ReturnToSsoPostResponse without neutralizing a script-closing sequence. The vulnerable value can enter the script block through the attacker-controlled next redirect parameter stored by warpgate-protocol-http/src/api/sso_provider_detail.rs or through IdP-derived error messages that make_redirect_url concatenates without URL encoding. The IdP-derived path is reachable when the attacker controls a configured identity provider, or when the attacker controls the email or username claim on an attacker-controlled account and the configured identity provider permits the required unvalidated claim format. A victim must complete the form_post SSO flow for the injected markup to be rendered. The Warpgate Content-Security-Policy blocks injected JavaScript and event handlers, so the demonstrated impact is content spoofing, a false login form, or a meta refresh rather than script execution. This issue is fixed in version 0.27.6.

EUVD references (3)

Affected products (1)

Vendor	Product	Versions	Platforms
warp-tech	warpgate	`< 0.27.6` (affected)	—

Vendor references (3)

References embedded in the original CVE record by the assigning CNA.

https://github.com/warp-tech/warpgate/security/advisories/GHSA-vvpj-p7j8-4rv4 x_refsource_CONFIRM
https://github.com/warp-tech/warpgate/commit/e94425a08f501383a67316673749dcbd637c6ce3 x_refsource_MISC
https://github.com/warp-tech/warpgate/releases/tag/v0.27.6 x_refsource_MISC

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (3)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://github.com/warp-tech/warpgate/commit/e94425a08f501383a67316673749dcbd637c6ce3 security-advisories@github.com
https://github.com/warp-tech/warpgate/releases/tag/v0.27.6 security-advisories@github.com
https://github.com/warp-tech/warpgate/security/advisories/GHSA-vvpj-p7j8-4rv4 security-advisories@github.com

Remediations (10)

Pennsylvania Access To Criminal History - Home - pa

web:epatch.pa.gov

Why does PATCH exist? Its purpose is to better enable the public to obtain criminal history record checks. The repository was created and is maintained in accordance with Pennsylvania's Criminal History Information Act contained in Chapter 91 of Title 18, Crimes Code. This Act also directs the Pennsylvania State Police (PSP) to disseminate criminal history data to criminal justice agencies ...

2026-09-22 17:08 UTC
SkyBlock Patch Notes | Hypixel Forums

web:hypixel.net

All SkyBlock Patch Notes can be found here! You can click the Watch button in this section to be alerted when new Patch Notes are released!

2026-09-22 17:08 UTC
GM 6.2L V8 Recall Fix Under Investigation After Failures

web:pickuptrucktalk.com

NHTSA expands its GM 6.2L V8 engine investigation to nearly 1 million 2021- 2026 trucks and SUVs after hundreds of post-recall failures.

2026-09-22 17:08 UTC
Changelog / Patch Notes - ARK - Official Community Forums

web:survivetheark.com

Changelog / Patch Notes The latest changes that have been made and are upcoming to ARK.

2026-09-22 17:08 UTC
Patch Tuesday September 2026: CVE Analysis | Automox

web:www.automox.com

September 2026 Patch Tuesday ships a record 973 CVEs , led by two exploited elevation of privilege bugs in the Windows Update Stack and ALPC. Plus unauthenticated RCE in DNS and Remote Desktop Services, a SQL Copilot read-only bypass, and an Outlook Reading Pane RCE.

2026-09-22 17:08 UTC
CVE: Common Vulnerabilities and Exposures

web:www.cve.org

At cve .org, we provide the authoritative reference method for publicly known information-security vulnerabilities and exposures

2026-09-22 17:08 UTC
Windows 11 emergency update: Microsoft races to fix bugs - MSN

web:www.msn.com

However, just one week later on Sept. 14, Microsoft rolled out an emergency, out-of-band patch for the patch . The linked update, KB5129194, applies to Windows 11 version 26H1. Windows 11 users ...

2026-09-22 17:08 UTC
Vitamin Patches - PatchMD

web:www.patchmd.com

Shop Patch MD for a wide variety of vitamin patches and online supplements. Browse our wide selection of topical patches online!

2026-09-22 17:08 UTC
Patch Notes — full list of updates｜S.T.A.L.K.E.R. 2: Heart of Chornobyl ...

web:www.stalker2.com

Patch notes A comprehensive archive of changes, tweaks, and fixes introduced with every patch and major update of S.T.A.L.K.E.R. 2: Heart of Chornobyl. Your feedback helps us refine the Zone — if you encounter an anomaly that doesn't belong there, report it via the Technical Support Hub.

2026-09-22 17:08 UTC
Microsoft admits Windows 11's emergency update still ... - Windows Latest

web:www.windowslatest.com

Windows 11's emergency update still breaks audio on some PCs, and it looks like a fix won't arrive until October 2026 Patch Tuesday, which is scheduled for October 13. On September 8 ...

2026-09-22 17:08 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-91165.json.

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                "id": "CVE-2026-91165",
                "options": [
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                  },
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                    "Technical Impact": "partial"
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                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-21T19:26:11.810922Z",
                "version": "2.0.3"
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