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Vulnerability Details :

CVE-2026-53500

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-31 Jul, 2026 | 18:35
Updated At-31 Jul, 2026 | 23:30
Rejected At-
Credits

Thumbor treats ALLOWED_SOURCES string patterns as unescaped regex, allowing hostname bypass via wildcard dot

Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, the ALLOWED_SOURCES configuration passes plain strings to re.match() without escaping dots, so a hostname differing at dot positions can match the allowlist. This issue is fixed in 7.8.0.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:31 Jul, 2026 | 18:35
Updated At:31 Jul, 2026 | 23:30
Rejected At:
▼CVE Numbering Authority (CNA)
Thumbor treats ALLOWED_SOURCES string patterns as unescaped regex, allowing hostname bypass via wildcard dot

Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, the ALLOWED_SOURCES configuration passes plain strings to re.match() without escaping dots, so a hostname differing at dot positions can match the allowlist. This issue is fixed in 7.8.0.

Affected Products
Vendor
thumbor
Product
thumbor
Versions
Affected
  • < 7.8.0
Problem Types
TypeCWE IDDescription
CWECWE-918CWE-918: Server-Side Request Forgery (SSRF)
Type: CWE
CWE ID: CWE-918
Description: CWE-918: Server-Side Request Forgery (SSRF)
Metrics
VersionBase scoreBase severityVector
3.18.2HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L
Version: 3.1
Base score: 8.2
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/thumbor/thumbor/security/advisories/GHSA-6x26-6r6f-m537
x_refsource_CONFIRM
https://github.com/thumbor/thumbor/commit/68876715350c6c8f49c324e5515e64908830aed7
x_refsource_MISC
https://github.com/thumbor/thumbor/releases/tag/7.8.0
x_refsource_MISC
Hyperlink: https://github.com/thumbor/thumbor/security/advisories/GHSA-6x26-6r6f-m537
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/thumbor/thumbor/commit/68876715350c6c8f49c324e5515e64908830aed7
Resource:
x_refsource_MISC
Hyperlink: https://github.com/thumbor/thumbor/releases/tag/7.8.0
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/thumbor/thumbor/security/advisories/GHSA-6x26-6r6f-m537
exploit
Hyperlink: https://github.com/thumbor/thumbor/security/advisories/GHSA-6x26-6r6f-m537
Resource:
exploit
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:31 Jul, 2026 | 19:17
Updated At:01 Aug, 2026 | 00:17

Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, the ALLOWED_SOURCES configuration passes plain strings to re.match() without escaping dots, so a hostname differing at dot positions can match the allowlist. This issue is fixed in 7.8.0.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.18.2HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L
N/A
Type: Secondary
Version: 3.1
Base score: 8.2
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L
Type: N/A
Version:
Base score:
Base severity: N/A
Vector:
CPE Matches

Weaknesses
CWE IDTypeSource
CWE-918Secondarysecurity-advisories@github.com
CWE ID: CWE-918
Type: Secondary
Source: security-advisories@github.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/thumbor/thumbor/commit/68876715350c6c8f49c324e5515e64908830aed7security-advisories@github.com
N/A
https://github.com/thumbor/thumbor/releases/tag/7.8.0security-advisories@github.com
N/A
https://github.com/thumbor/thumbor/security/advisories/GHSA-6x26-6r6f-m537security-advisories@github.com
N/A
https://github.com/thumbor/thumbor/security/advisories/GHSA-6x26-6r6f-m537134c704f-9b21-4f2e-91b3-4a467353bcc0
N/A
Hyperlink: https://github.com/thumbor/thumbor/commit/68876715350c6c8f49c324e5515e64908830aed7
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/thumbor/thumbor/releases/tag/7.8.0
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/thumbor/thumbor/security/advisories/GHSA-6x26-6r6f-m537
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/thumbor/thumbor/security/advisories/GHSA-6x26-6r6f-m537
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Resource: N/A

Change History

0
Information is not available yet

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Matching Score-4
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Assigner-GitHub, Inc.
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EPSS-0.30% / 22.10%
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Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
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Action-Not Available
Vendor-opensiftOpenSift
Product-opensiftOpenSift
CWE ID-CWE-918
Server-Side Request Forgery (SSRF)
Details not found