CVE-2026-1520 rethinkdb Secondary Index cross site scripting
Attackers can execute arbitrary scripts in the RethinkDB web interface via the Secondary Index Handler, potentially compromising user sessions.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-1520?
CVE-2026-1520 is a medium-severity cross-site scripting vulnerability in rethinkdb, published on 28 Jan 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
A vulnerability was identified in rethinkdb up to 2.4.3. Affected by this issue is some unknown functionality of the component Secondary Index Handler. Such manipulation leads to cross site scripting. It is possible to launch the attack remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.
Which versions are affected by CVE-2026-1520?
How do I fix CVE-2026-1520?
No fix has been published for CVE-2026-1520 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-1520 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-1520 exists.
Sources
Also known as GHSA-q425-79xc-4mv2.