CVE-2026-58491: warp-tech warpgate · Cross-site Scripting
Affects warp-tech warpgateSource CVE Database V5
Not known to be exploited · CVSS 9.3 Critical : upgrade to 0.25.5 as a priority.
Data as of 5 Nov 2026, 00:01 UTC
- EPSS
- 0.4% chance of exploitation in 30 days – higher than 39% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 0.25.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 21 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.
What to do
Upgrade warpgate and warp-tech/warpgate to 0.25.5.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| warp-techwarpgate | Affected
| Fixed in
|
GitHubwarp-tech/warpgatepkg:github/warp-tech/warpgateOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
This vulnerability is fixed in Warpgate version 0.25.5. Users and administrators should upgrade to version 0.25.5 or later to remediate this issue. No additional mitigation steps are required once the update is applied.
Description
CVE-2026-58491 is a critical cross-site scripting (XSS) vulnerability in the open source bastion host Warpgate prior to version 0.25.5. The vulnerability arises from improper neutralization of an attacker-controlled 'next' parameter in the SSO API endpoints, which is inserted into HTTP responses without HTML escaping. This allows an attacker to execute arbitrary JavaScript in the context of an authenticated user's browser, potentially exposing session data and enabling unauthorized actions via user and administrator APIs. Additionally, the same parameter can be used for open redirect attacks. The issue is fixed in Warpgate version 0.25.5.