CVE Explorer
CVE-2026-27205
Flask is a web server gateway interface (WSGI) web application framework. In versions 3.1.2 and below, when the session object is accessed, Flask should set the Vary: Cookie header., resulting in a Use of Cache Containing Sensitive Information vulnerability. The logic instructs caches not to cache the response, as it may contain information specific to a logged in user. This is handled in most cases, but some forms of access such as the Python in operator were overlooked. The severity and risk d
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"flask","vendor":"pallets","versions":[{"status":"affected","version":"< 3.1.3"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:1b1975e6edf7cd40ac3673ef47d9e7af4bd468eb16b705ff29a9de46ddffee11 · sha256:e4db04c4d72212e7… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":2.3,"baseSeverity":"LOW","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:1b1975e6edf7cd40ac3673ef47d9e7af4bd468eb16b705ff29a9de46ddffee11 · sha256:e4db04c4d72212e7… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-524","description":"CWE-524: Use of Cache Containing Sensitive Information","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:1b1975e6edf7cd40ac3673ef47d9e7af4bd468eb16b705ff29a9de46ddffee11 · sha256:e4db04c4d72212e7… · /containers/cna/problemTypes/0/descriptions/0
Source references
3 source assertions{"name":"https://github.com/pallets/flask/commit/089cb86dd22bff589a4eafb7ab8e42dc357623b4","tags":["x_refsource_MISC"],"url":"https://github.com/pallets/flask/commit/089cb86dd22bff589a4eafb7ab8e42dc357623b4"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:1b1975e6edf7cd40ac3673ef47d9e7af4bd468eb16b705ff29a9de46ddffee11 · sha256:e4db04c4d72212e7… · /containers/cna/references/1
{"name":"https://github.com/pallets/flask/releases/tag/3.1.3","tags":["x_refsource_MISC"],"url":"https://github.com/pallets/flask/releases/tag/3.1.3"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:1b1975e6edf7cd40ac3673ef47d9e7af4bd468eb16b705ff29a9de46ddffee11 · sha256:e4db04c4d72212e7… · /containers/cna/references/2
{"name":"https://github.com/pallets/flask/security/advisories/GHSA-68rp-wp8r-4726","tags":["x_refsource_CONFIRM"],"url":"https://github.com/pallets/flask/security/advisories/GHSA-68rp-wp8r-4726"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:1b1975e6edf7cd40ac3673ef47d9e7af4bd468eb16b705ff29a9de46ddffee11 · sha256:e4db04c4d72212e7… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.