TI-2026-74025 Aliases CVE-2026-73535

Second-factor bypass in Gitea OpenID identity linking

MEDIUM 40CWE-304Published 2026-10-14 · Updated 2026-10-18

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.

Summary

Gitea versions through 1.27.1 have a flaw in their OpenID connect handler: it accepts a password without enforcing enrolled TOTP or WebAuthn verification before completing sign-in and linking an OpenID identifier (CWE-304). When OpenID sign-in is enabled, an attacker who knows the victim's password can link an attacker-controlled OpenID identifier to the victim's account. The attacker can then sign in through that identifier without the password or second factor, and a password change does not remove the link.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

Gitea's OpenID connect handler accepts a user's password without enforcing enrolled TOTP or WebAuthn verification before completing sign-in and linking an OpenID identifier. When OpenID sign-in is enabled, an attacker who knows the victim's password can obtain a session and link an attacker-controlled identifier. The attacker can then sign in through that identifier without the victim's password or second factor, and a password change does not remove the link.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00447 39th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Gitea	Gitea	up to 1.27.1	—	No fix listed	CNA

Gitea VendorGitea Affected up to 1.27.1 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:gitea:gitea::::::::	—	—	Gitea

cpe:2.3:a:gitea:gitea:*:*:*:*:*:*:*:* Versions — — ·Gitea

Remediation

The sources list no fixed version for Gitea.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-14 Threatist record created from CVE-2026-73535
2026-10-18 CVSS score added · CISA ADP
2026-10-18 CISA SSVC decision points changed
2026-10-19 Priority changed: LOW → MEDIUM
2026-10-21 Affected versions changed · Red Hat
2026-10-21 CVSS score added · Red Hat

References

Patch 2

Advisory 1

GitHub Security Advisory GHSA-8xjr-x7rg-hp5h

Other 2

TI-2026-42785 Gitea before 1.27.1 allows remote code execution via the diffpatch API through Git hook installation. KEVCVSS 3.1CRITICAL 9.8
TI-2026-42033 Improper authorization on OAuth sign-in callback silently re-enables administrator-disabled accounts CVSS 3.1CRITICAL 9.8
TI-2026-40842 Privilege Escalation via Access Token Scope Escalation in API CVSS 3.1CRITICAL 9.8
TI-2026-16922 Gitea Docker image trusts spoofable reverse-proxy headers by default CVSS 3.1CRITICAL 9.8
TI-2026-42043 Team-repository linking endpoint bypasses the RepoAdminChangeTeamAccess organization setting CVSS 3.1CRITICAL 9.1
TI-2026-40381 OIDC userinfo Endpoint Returns Identity Claims Without Enforcing API Token Scopes CVSS 3.1CRITICAL 9.1

See all 240 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences