Quick answers
- Is CVE-2026-86113 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-86113 being exploited in the wild.
- How severe is CVE-2026-86113?
- Medium severity, with a CVSS score of 6.5, published 5 September 2026.
- Which products and versions are affected?
- BookWyrm through 0.9.1.
- Is there a fix for CVE-2026-86113?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-86113 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-86113?
- Check whether you run BookWyrm at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is an authorization bypass in the edit_readthrough function that fails to properly verify that an authenticated user owns the reading record being modified. An attacker can exploit predictable, sequential ReadThrough object IDs to craft requests that modify other users' reading records—changing start dates, finish dates, reading progress, and progress mode. No special privileges are required beyond basic authentication, and the attack is straightforward to execute via direct HTTP requests. The vulnerability affects all versions through 0.9.1; patches are available in later releases.
Affected products
- BookWyrm BookWyrm through 0.9.1
Timeline
- 2026-09-05: disclosed