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VulnerabilityPublished Updated

CVE-2024-27306: aiohttp Cross-site Scripting vulnerability on index pages for static file handling

Affects aiohttpSource GCVE Database

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Authoritative record:CVE-2024-27306· Medium 6.1

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

CVSS 3.1 base score
6.1Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (GitHub_M)CVSS 3.16.1
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:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 3 Nov 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
PyPIaiohttpAffected
  • <3.9.4
Fixed in
  • 3.9.4

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

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