2.3

CVSS Score

4.0

-

CVSS Score

Basic Information

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CVE-2026-6907

CVE-2026-6907: Potential exposure of private data due to incorrect handling of Vary: * in UpdateCacheMiddleware

An issue was discovered in 6.0 before 6.0.5 and 5.2 before 5.2.14. django.middleware.cache.UpdateCacheMiddleware erroneously caches requests where the Vary header contained an asterisk ('*'). This can lead to private data being stored and served. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Ahmad Sadeddin for reporting this issue.

(GitHub Advisory)

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CVE-2026-6907

CVE-2026-6907:

2.3

CVSS Score

4.0

-

CVSS Score

Basic Information

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Technical Details

SSVC / BOD 26-04 ↗

Exploitation NoneAutomatable NoTech Impact Partial

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Package Name	Ecosystem	Vulnerable Versions	First Patched Version
Django	pip	>= 6.0, < 6.0.5	6.0.5
Django	pip	>= 5.2, < 5.2.14	5.2.14

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability lies in the UpdateCacheMiddleware's handling of the Vary HTTP header. Specifically, the process_response method would cache responses even when the Vary header contained '*', a value that indicates the response is unique to the current request and should not be cached. This could lead to sensitive or user-specific data being cached and subsequently served to other users. The patch addresses this by explicitly checking for the presence of '*' in the Vary header and, if found, preventing the response from being cached. The vulnerable function is therefore UpdateCacheMiddleware.process_response as it is the function responsible for this incorrect caching behavior.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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