CVE-2026-35594Public exploitNetwork attack vector

Revoked project access via unvalidated link-share JWTs

Published Apr 10, 2026 · Updated Apr 10, 2026

Insufficient session expiration in Vikunja before 2.3.0 allows remote attackers to retain revoked link-share access to project data. GetLinkShareFromClaims builds authorization objects solely from JWT claims without querying the database for deletion or reduced permissions. Exploitation requires a previously issued link-share JWT, which retains its original project permissions for up to the configured 72-hour default lifetime.

CVSS severity6.5
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient session expiration in Vikunja before 2.3.0 allows remote attackers to retain revoked link-share access to project data. GetLinkShareFromClaims builds authorization objects solely from JWT claims without querying the database for deletion or reduced permissions. Exploitation requires a previously issued link-share JWT, which retains its original project permissions for up to the configured 72-hour default lifetime.

The record

CVE
CVE-2026-35594
Published
Apr 10, 2026
Updated
Apr 10, 2026
Vendor
Vikunja
Product
Vikunja
Classifications
CWE-613, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 10, 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=< 2.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vikunja · Vikunjaversion=< 2.3.0

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-613Insufficient Session Expiration
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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