CVE-2024-27306: aiohttp Cross-site Scripting vulnerability on index pages for static file handling
Affects aiohttpSource GCVE Database
Not known to be exploited · CVSS 6.1 Medium : upgrade to 3.9.4 when convenient.
Data as of 29 Oct 2026, 22:52 UTC
Thin evidence
One scorer or none| CNA (GitHub_M) | CVSS 3.1 | 6.1 |
|---|
- Patch
- Available – fixed in 3.9.4
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 3 Nov 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.
What to do
Upgrade aiohttp to 3.9.4.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| PyPIaiohttp | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
Description
### Summary A XSS vulnerability exists on index pages for static file handling. ### Details When using `web.static(..., show_index=True)`, the resulting index pages do not escape file names. If users can upload files with arbitrary filenames to the static directory, the server is vulnerable to XSS attacks. ### Workaround We have always recommended using a reverse proxy server (e.g. nginx) for serving static files. Users following the recommendation are unaffected. Other users can disable `show_index` if unable to upgrade. ----- Patch: https://github.com/aio-libs/aiohttp/pull/8319/files
References
- github.com/aio-libs/aiohttp/security/advisories/GHSA-7gpw-8wmc-pm8g (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2024-27306 (opens in a new tab)
- github.com/aio-libs/aiohttp/pull/8319 (opens in a new tab)
- github.com/aio-libs/aiohttp/pull/8319/files (opens in a new tab)
- github.com/aio-libs/aiohttp/commit/28335525d1eac015a7e7584137678cbb6ff19397 (opens in a new tab)
- github.com/aio-libs/aiohttp (opens in a new tab)
- lists.debian.org/debian-lts-announce/2025/02/msg00002.html (opens in a new tab)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2EXRGTN2WG7VZLUZ7WOXU5GQJKCPPHKP (opens in a new tab)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NWEI6NIHZ3G7DURDZVMRK7ZEFC2BTD3U (opens in a new tab)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZIVBMPEY7WWOFMC3CWXFBRQPFECV4SW3 (opens in a new tab)