CVE-2026-55987Public exploitNetwork attack vector

Account reactivation via empty refresh-token check

Published Aug 13, 2026 · Updated Aug 13, 2026

Incorrect authorization in Gitea 1.26.4 and earlier allows remote authenticated users to reactivate deactivated accounts through OAuth2. The handleOAuth2SignIn gate treats an empty stored refresh token as proof that auto-sync disabled the user, then writes IsActive=true. A deactivated user with a linked GitHub or no-refresh-token OAuth2 account can regain the account's prior access; Prohibit Login remains enforced.

CVSS severity8.1
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Gitea 1.26.4 and earlier allows remote authenticated users to reactivate deactivated accounts through OAuth2. The handleOAuth2SignIn gate treats an empty stored refresh token as proof that auto-sync disabled the user, then writes IsActive=true. A deactivated user with a linked GitHub or no-refresh-token OAuth2 account can regain the account's prior access; Prohibit Login remains enforced.

The record

CVE
CVE-2026-55987
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
Gitea
Product
Gitea
Classifications
CWE-863, T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.26.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Gitea · Giteaversion=0 <=1.26.4

Published CVSS scores

8.1GiteaCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1078Valid Accounts

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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