CVE Explorer
CVE-2026-53501
Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, Thumbor’s HMAC validation can be bypassed due to the use of Python’s .replace() when removing the signature from the URL before validation. Since .replace() removes all occurrences of the substring, an attacker can insert the same signature multiple times in the URL and manipulate the final URL used for validation. This allows crafting URLs where the validated string differs from the actual requested resource, enabli
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"thumbor","vendor":"thumbor","versions":[{"status":"affected","version":"< 7.8.0"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:9ee00e753a5cc42b5b02571622a4d533ad99579a42c37d5f8e6369e211c6926e · sha256:35456d87586024e1… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":8.2,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:9ee00e753a5cc42b5b02571622a4d533ad99579a42c37d5f8e6369e211c6926e · sha256:35456d87586024e1… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-347","description":"CWE-347: Improper Verification of Cryptographic Signature","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:9ee00e753a5cc42b5b02571622a4d533ad99579a42c37d5f8e6369e211c6926e · sha256:35456d87586024e1… · /containers/cna/problemTypes/0/descriptions/0
Source references
3 source assertions{"name":"https://github.com/thumbor/thumbor/commit/e3ae3e2500537b4d735df4144129a649374bb70b","tags":["x_refsource_MISC"],"url":"https://github.com/thumbor/thumbor/commit/e3ae3e2500537b4d735df4144129a649374bb70b"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:9ee00e753a5cc42b5b02571622a4d533ad99579a42c37d5f8e6369e211c6926e · sha256:35456d87586024e1… · /containers/cna/references/1
{"name":"https://github.com/thumbor/thumbor/releases/tag/7.8.0","tags":["x_refsource_MISC"],"url":"https://github.com/thumbor/thumbor/releases/tag/7.8.0"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:9ee00e753a5cc42b5b02571622a4d533ad99579a42c37d5f8e6369e211c6926e · sha256:35456d87586024e1… · /containers/cna/references/2
{"name":"https://github.com/thumbor/thumbor/security/advisories/GHSA-mw3h-qjxj-6xg9","tags":["x_refsource_CONFIRM"],"url":"https://github.com/thumbor/thumbor/security/advisories/GHSA-mw3h-qjxj-6xg9"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:9ee00e753a5cc42b5b02571622a4d533ad99579a42c37d5f8e6369e211c6926e · sha256:35456d87586024e1… · /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.