CVE-2026-59931

HIGHPre-NVD 7.77.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (42nd 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
7.7EG
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: 7.7Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. In versions 4.0.0 through 5.8.0, 3.3.0 through 3.10.6, 2.2.0 through 2.4.6, 2.0.0 through 2.1.17, and all releases up to and including 1.30.5, the WEBSERVICE() domain whitelist can be bypassed via an HTTP redirect (SSRF). In Calculation/Web/Service.php, the webService() method validates a URL's host against the whitelist set via Spreadsheet::setDomainWhiteList(), then fetches content with file_get_contents($url, false, $ctx); because PHP's HTTP stream wrapper follows 301/302 redirects automatically (up to 20 hops) and the redirect target is never re-validated, an attacker who can trigger a redirect from a whitelisted domain can reach arbitrary URLs, including internal addresses. An attacker able to upload XLSX files to an application that uses setDomainWhiteList() and getCalculatedValue() can achieve a full-read SSRF, returning up to 32,767 bytes of the response body as a cell's calculated value, which enables exfiltration of cloud metadata (AWS/GCP/Azure credentials via http://169.254.169.254/), access to internal-only services, and internal port scanning (the port is not validated). This issue has been fixed in versions 5.8.1, 3.10.7, 2.4.7, 2.1.18, and 1.30.6.

CVSS v3
7.7
EG Score
7.7HIGHmedium confidence
EG Risk
39
EG Risk 39/100CISA 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
Severity77% × 45%
Exploitation1% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or 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
43rd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or 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 none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). 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 23, 2026

Last Modified

July 30, 2026

Advisory Details (7)

Auto-updated Jul 28, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_release.
github_release Patch Available

5.8.1

Patch available: PHPOffice/PhpSpreadsheet 5.8.1

https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/5.8.1
github_release Patch Available

3.10.7

Patch available: PHPOffice/PhpSpreadsheet 3.10.7

https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/3.10.7
github_release Patch Available

2.4.7

Patch available: PHPOffice/PhpSpreadsheet 2.4.7

https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.4.7
github_release Patch Available

2.1.18

Patch available: PHPOffice/PhpSpreadsheet 2.1.18

https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/2.1.18
github_release Patch Available

1.30.6

Patch available: PHPOffice/PhpSpreadsheet 1.30.6

https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/1.30.6
github_commit Patch Available

commit 7ef7b25e8548 (PHPOffice/PhpSpreadsheet)

Patch available: PHPOffice/PhpSpreadsheet 5.8.1 (contains commit 7ef7b25e8548)

https://github.com/PHPOffice/PhpSpreadsheet/commit/7ef7b25e8548a6ded79dac74e2e2c7acdac38d8d
githubMentions a patch (unverified)🟡 PoC Available

SSRF bypass via HTTP redirect in WEBSERVICE() domain whitelist · Advisory · PHPOffice/PhpSpreadsheet · GitHub

https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-6hq5-7373-42rg

Vendor Advisories for CVE-2026-59931(1)

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

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
phpoffice/phpspreadsheet1.0.0 ... 1.9.0 (63 versions)
  • 4.0.0 up to 5.8.1: fixed in 5.8.1
  • 3.3.0 up to 3.10.7: fixed in 3.10.7
  • 2.2.0 up to 2.4.7: fixed in 2.4.7
  • 2.0.0 up to 2.1.18: fixed in 2.1.18
  • every version up to 1.30.6: fixed in 1.30.6
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 39× 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 118 total refreshes for this CVE.

  1. 2026-10-10 20:00 UTCEPSS rescore
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  1. 2026-09-18 22:33 UTCEG score recompute
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Frequently asked(5)

What is CVE-2026-59931?
CVE-2026-59931 is a high vulnerability published on July 23, 2026. PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. In versions 4.0.0 through 5.8.0, 3.3.0 through 3.10.6, 2.2.0 through 2.4.6, 2.0.0 through 2.1.17, and all releases up to and including 1.30.5, the WEBSERVICE() domain whitelist can be bypassed via an HTTP redirect…
When was CVE-2026-59931 disclosed?
CVE-2026-59931 was first published on July 23, 2026, with the most recent update on July 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59931 actively exploited?
CVE-2026-59931 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (43rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-59931?
CVE-2026-59931 has a CVSS base score of 7.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-59931?
A fix for CVE-2026-59931 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-59931 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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