CVE-2026-52802: Gogs open redirect in IsSameSite validation

CVE-2026-52802 · Severity: medium · CVSS 5.4 · Published 2026-06-24

Gogs, a self-hosted Git service, is vulnerable to an open redirect flaw. Attackers can create malicious links that appear to belong to a trusted Gogs instance but actually redirect users to external, potentially harmful websites. This can be used in phishing campaigns to steal user credentials or distribute malware by exploiting the user's trust in the original domain.

Technologies: gogs.io/gogs (Go), Gogs. Vendors: Go, Gogs.

Quick answers

Is CVE-2026-52802 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-52802 being exploited in the wild.
How severe is CVE-2026-52802?
Medium severity, with a CVSS score of 5.4, published 24 June 2026.
Which products and versions are affected?
gogs.io/gogs (Go) <= 0.14.2, SEMVER:introduced=0, SEMVER:introduced=0,fixed=0.14.3; Gogs < 0.14.3, <= 0.14.2.
Is there a fix for CVE-2026-52802?
Yes. gogs.io/gogs (Go): upgrade to 0.14.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-52802 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-52802?
Check whether you run gogs.io/gogs (Go) or Gogs at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • gogs.io/gogs (Go): upgrade to 0.14.3 or later
    go get gogs.io/gogs@v0.14.3

Technical details

An open redirect vulnerability exists in Gogs prior to version 0.14.3 due to a flaw in the 'IsSameSite' validation function. The function only inspects the first two characters of a URL to ensure it is a relative path (starting with '/' but not '//' or '/\'). However, it fails to account for directory traversal sequences followed by backslashes (e.g., '/a/../\example.com'). Because modern web browsers normalize backslashes to forward slashes, the resulting path is interpreted as a cross-origin redirect (e.g., '//example.com'). Attackers can exploit this by crafting 'redirect_to' parameters in login or post-action flows to facilitate phishing or credential theft. The issue is fixed in version 0.14.3 by hardening the URL parsing and normalization logic.

Affected products

  • Gogs Gogs < 0.14.3

Identifiers

  • CVE-2026-52802
  • GHSA-xxhq-69mf-w8cr
  • GO-2026-5773

Timeline

  • 2026-06-05: patched: Fix merged into main branch
  • 2026-06-07: advisory: Release v0.14.3 published
  • 2026-06-24: disclosed: CVE-2026-52802 published

References

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