Vulnerability · Published May 26, 2026 · Assigned by GitHub_M

CVE-2026-44776Kavita: IDOR in /api/Download/*

Medium 5.9

In plain English

A medium-severity authorization bypass via user-controlled key in Kavita from Kareadita. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities).

Severity (CVSS 4.0)5.9Medium

Exploit odds (30 days)0.2%top 83.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Kavita is a cross platform reading server. Prior to 0.9.0, the download, size-check, and chapter metadata endpoints do not enforce library-level authorization. A low-privileged user who knows or guesses a chapterId, volumeId, or seriesId belonging to a library they are not assigned to can download the full file contents, query file sizes, and read metadata for that content. This affects /api/Download/volume-size, /api/Download/chapter-size, /api/Download/series-size, /api/Download/volume, /api/Download/chapter, /api/Download/series, and /api/Chapter. This vulnerability is fixed in 0.9.0.

Affected products (as reported)

Vendor	Product	Versions
Kareadita	Kavita	< 0.9.0

Weakness: CWE-639 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

References

https://github.com/Kareadita/Kavita/security/advisories/GHSA-x3jq-95xw-gwvr x_refsource_CONFIRM