CVE-2026-33312: Read-only Vikunja users can delete project background images via broken object-level authorization
Vulnerability summary
CVE-2026-33312 is a medium (CVSS 5.4) Incorrect Authorization vulnerability in go-vikunja vikunja. EPSS estimates a 0.32% chance of exploitation in the next 30 days, higher than 23.7% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 2 · Related 2Timeline
- 20-03-2026PublishedVulnerability first disclosed.
- 20-03-2026Last modifiedVulnerability information updated.
Description
Vikunja is an open-source self-hosted task management platform. Starting in version 0.20.2 and prior to version 2.2.0, the `DELETE /api/v1/projects/:project/background` endpoint checks `CanRead` permission instead of `CanUpdate`, allowing any user with read-only access to a project to permanently delete its background image. Version 2.2.0 fixes the issue.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · GoEcosystem advisory · calculated5.3MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- NVDNIST5.3MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS trend
Probability
0.32%
Chance of exploitation in the next 30 days
Percentile
24%
Versus all other CVEs
30-day change
Increase +0.11 pp
From 0.21% on 22-09-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundVikunja
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Code.vikunja.io1 product
- api≥ 0.20.2, < 2.2.0 | ≥ 0.20.2 (No fix recorded)
Go-vikunja1 product
- vikunja≥ 0.20.2, < 2.2.0
Vikunja1 product
- vikunja≥ 0.20.2, < 2.2.0
3 vendors · 3 products
References
4 links- github.com/go-vikunja/vikunja/security/advisories/GHSA-564f-wx8x-878hX Refsource CONFIRMWEBAdvisoryExploitVendor Advisory
