CVE-2023-30186 — A use after free issue discovered in ONLYOFFICE DocumentServer 4

A use after free issue discovered in ONLYOFFICE DocumentServer 4.0.3 through 7.3.2 allows remote attackers to run arbitrary code via crafted JavaScript file.

01What is this vulnerability?

A use after free issue discovered in ONLYOFFICE DocumentServer 4.0.3 through 7.3.2 allows remote attackers to run arbitrary code via crafted JavaScript file.

02Affected products

No structured affected-product list available — see references below for vendor advisories.

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: 2023-08-14T13:15:10.420
• Last modified: 2026-07-09T01:18:16.730

09References

• gist.github.com — https://gist.github.com/merrychap/25eba8c4dd97c9e545edad1b8f0eadc2
• github.com — https://github.com/ONLYOFFICE/DocumentServer
• github.com — https://github.com/ONLYOFFICE/core/blob/8ca40a44ce47a86168327a46db91253cf6bb205d…
• github.com — https://github.com/ONLYOFFICE/core/blob/8ca40a44ce47a86168327a46db91253cf6bb205d…
• github.com — https://github.com/ONLYOFFICE/core/commit/2b6ad83b36afd9845085b536969d366d1d6115…
• gist.github.com — https://gist.github.com/merrychap/25eba8c4dd97c9e545edad1b8f0eadc2
• github.com — https://github.com/ONLYOFFICE/DocumentServer
• github.com — https://github.com/ONLYOFFICE/core/blob/8ca40a44ce47a86168327a46db91253cf6bb205d…
• github.com — https://github.com/ONLYOFFICE/core/blob/8ca40a44ce47a86168327a46db91253cf6bb205d…
• github.com — https://github.com/ONLYOFFICE/core/commit/2b6ad83b36afd9845085b536969d366d1d6115…