CVE-2019-11594 — In AdBlock before 3

In AdBlock before 3.45.0, the $rewrite filter option allows filter-list maintainers to run arbitrary code in a client-side session when a web service loads a script for execution using XMLHttpRequest or Fetch, and the script origin has an open redirect.

01What is this vulnerability?

In AdBlock before 3.45.0, the $rewrite filter option allows filter-list maintainers to run arbitrary code in a client-side session when a web service loads a script for execution using XMLHttpRequest or Fetch, and the script origin has an open redirect.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-04-29T14:30:50.000Z
• Last modified: 2024-08-04T22:55:41.041Z

09References

• armin.dev — https://armin.dev/blog/2019/04/adblock-plus-code-injection/
• news.ycombinator.com — https://news.ycombinator.com/item?id=19666504
• blog.getadblock.com — https://blog.getadblock.com/adblock-for-chrome-3-45-0-resolving-a-potential-secu…