How severe is CVE-2023-5057?

CVE-2023-5057 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2023-5057 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-5057?

CVE-2023-5057 affects Automattic Activitypub. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-5057?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-5057 published?

CVE-2023-5057 was published on 2023-10-16 and last updated on 2026-06-17.

CVE-2023-5057

CVE-2023-5057 is a medium-severity vulnerability in Automattic Activitypub with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Automattic Activitypub
Published: 2023-10-16
Last modified: 2026-06-17

Description

The ActivityPub WordPress plugin before 1.0.0 does not escape user metadata before outputting them in mentions, which could allow users with a role of Contributor and above to perform Stored XSS attacks

Frequently asked questions

What is CVE-2023-5057?: The ActivityPub WordPress plugin before 1.0.0 does not escape user metadata before outputting them in mentions, which could allow users with a role of Contributor and above to perform Stored XSS attacks
How severe is CVE-2023-5057?: CVE-2023-5057 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2023-5057 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-5057?: CVE-2023-5057 affects Automattic Activitypub. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-5057?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-5057 published?: CVE-2023-5057 was published on 2023-10-16 and last updated on 2026-06-17.

References

https://wpscan.com/vulnerability/58a63507-f0fd-46f1-a80c-6b1c41dddcf5

Affected products (1)

cpe:2.3:a:automattic:activitypub:*:*:*:*:*:wordpress:*:*

More vulnerabilities in Automattic Activitypub

CVE-2026-4338 — High (CVSS 7.5): The ActivityPub WordPress plugin before 8.0.2 does not properly filter posts to be displayed, allowed unauthenticated…
CVE-2023-3746 — Medium (CVSS 5.4): The ActivityPub WordPress plugin before 1.0.0 does not sanitize and escape some data from post content, which could…
CVE-2023-3707 — Medium (CVSS 4.3): The ActivityPub WordPress plugin before 1.0.0 does not ensure that post contents to be displayed are public and belong…
CVE-2023-3706 — Medium (CVSS 4.3): The ActivityPub WordPress plugin before 1.0.0 does not ensure that post titles to be displayed are public and belong to…

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