CVE-2026-53500

HIGHPre-NVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (40th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.2Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
8.2
EG Score
8.2HIGHmedium confidence
EG Risk
68
EG Risk 68/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity82% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
40th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 31, 2026

Last Modified

September 8, 2026

Advisory Details (3)

Auto-updated Jul 31, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_release.
github_release Patch Available

Release 7.8.0

Patch available: thumbor/thumbor 7.8.0

https://github.com/thumbor/thumbor/releases/tag/7.8.0
github_commit Patch Available

commit 68876715350c (thumbor/thumbor)

Patch available: thumbor/thumbor 7.8.0 (contains commit 68876715350c)

https://github.com/thumbor/thumbor/commit/68876715350c6c8f49c324e5515e64908830aed7
github Patch Available🟡 PoC Available

ALLOWED_SOURCES string patterns treated as unescaped regex, allowing hostname bypass via wildcard dot · Advisory · thumbor/thumbor · GitHub

https://github.com/thumbor/thumbor/security/advisories/GHSA-6x26-6r6f-m537

Vendor Advisories for CVE-2026-53500(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(2 across 2 ecosystems)
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
thumbor6.3.2-3 ... 7.7.7-6 (16 versions)
  • every version up to 7.8.0-1: fixed in 7.8.0-1
—
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
thumbor4.1.3 ... 7.7.7 (118 versions)
  • every version up to 7.8.0: fixed in 7.8.0
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 108 total refreshes for this CVE.

  1. 2026-10-04 23:50 UTCEG score recompute
  2. 2026-10-04 23:22 UTCEPSS rescore
  3. 2026-10-04 06:29 UTCEG score recompute
  4. 2026-10-03 14:26 UTCEPSS rescore
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  20. 2026-09-22 21:34 UTCEG score recompute
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  23. 2026-09-20 20:16 UTCEPSS rescore
  24. 2026-09-19 23:41 UTCEG score recompute
  25. 2026-09-19 04:00 UTCEG score recompute
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  1. 2026-09-18 19:28 UTCEPSS rescore
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  27. 2026-09-01 13:54 UTCEPSS rescore
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  34. 2026-08-28 21:41 UTCEPSS rescore
  35. 2026-08-26 21:58 UTCEG score recompute
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  38. 2026-08-25 13:49 UTCEPSS rescore
  39. 2026-08-24 18:07 UTCEG score recompute
  40. 2026-08-23 03:15 UTCEG score recompute
  41. 2026-08-23 00:19 UTCEPSS rescore
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  43. 2026-08-21 23:49 UTCEPSS rescore
  44. 2026-08-20 23:26 UTCEG score recompute
  45. 2026-08-20 22:55 UTCEPSS rescore
  46. 2026-08-19 21:36 UTCEG score recompute
  47. 2026-08-19 17:04 UTCEPSS rescore
  48. 2026-08-18 19:11 UTCEG score recompute
  49. 2026-08-18 13:48 UTCEPSS rescore
  50. 2026-08-17 17:17 UTCEG score recompute
  51. 2026-08-17 13:47 UTCEPSS rescore
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  53. 2026-08-16 14:56 UTCEPSS rescore
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  74. 2026-08-04 19:06 UTCEG score recompute
  75. 2026-08-04 15:10 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-53500?
CVE-2026-53500 is a high vulnerability published on July 31, 2026. 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.
When was CVE-2026-53500 disclosed?
CVE-2026-53500 was first published on July 31, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53500 actively exploited?
CVE-2026-53500 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-53500?
CVE-2026-53500 has a CVSS base score of 8.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-53500?
A fix for CVE-2026-53500 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-53500 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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