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Response snapshot Oct 28, 2026, 17:11 UTC

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VulnerabilityCVE-2026-71553

ApostropheCMS: 2nd-order prototype pollution via PATCH leading to single-request persistent DoS

The vulnerability is a single-request persistent DoS by submitting e.g. "PATCH /api/v1/article/ " with a valid editor session and body of {"toString.call":"x"}, overwriting the global toString function with value x. Fabian

At a glance

Exploited
Not known
Severity
7.1 High (CVSS 4.0)
Chance of exploitation
Not estimated
Sources
1 source

What to do

GitHub lists first patched versions: apostrophe: 4.32.1. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-vmg4-6gfg-83qx (opens a new tab)

What happened

The vulnerability is a single-request persistent DoS by submitting e.g. "PATCH /api/v1/article/ " with a valid editor session and body of {"toString.call":"x"}, overwriting the global toString function with value x.

Fabian

Affected package ranges reported by GitHub: apostrophe: <= 4.32.0

Scores and how they were measured

CVSS base severity

7.1

Version 4.0As of

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

Not available

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-vmg4-6gfg-83qx (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-vmg4-6gfg-83qx, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 28). ApostropheCMS: 2nd-order prototype pollution via PATCH leading to single-request persistent DoS (CVE-2026-71553). https://kevwire.com/record/CVE-2026-71553

MLA

"ApostropheCMS: 2nd-order prototype pollution via PATCH leading to single-request persistent DoS (CVE-2026-71553)." KEVWire, 28 Oct. 2026, kevwire.com/record/CVE-2026-71553.

Chicago

KEVWire. "ApostropheCMS: 2nd-order prototype pollution via PATCH leading to single-request persistent DoS (CVE-2026-71553)." Last modified October 28, 2026. https://kevwire.com/record/CVE-2026-71553.

Evidence summary (plain text)

ApostropheCMS: 2nd-order prototype pollution via PATCH leading to single-request persistent DoS (Sep 2, 2026).
The vulnerability is a single-request persistent DoS by submitting e.g.
"PATCH /api/v1/article/ " with a valid editor session and body of
{"toString.call":"x"}, overwriting the global toString function with
value x.

Fabian
CVSS 7.1 (version 4.0; evidence as of Oct 28, 2026; https://github.com/advisories/GHSA-vmg4-6gfg-83qx).
Sources:
GitHub-reviewed advisory GHSA-vmg4-6gfg-83qx: https://github.com/advisories/GHSA-vmg4-6gfg-83qx
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
Record ID: CVE-2026-71553.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 28, 2026, 16:55 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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Record details

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