How severe is CVE-2013-0731?

CVE-2013-0731 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2013-0731 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2013-0731?

CVE-2013-0731 primarily affects Mailup Wp-mailup. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2013-0731?

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

When was CVE-2013-0731 published?

CVE-2013-0731 was published on 2013-03-22 and last updated on 2026-06-16.

CVE-2013-0731

CVE-2013-0731 is a medium-severity vulnerability in Mailup Wp-mailup with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-264.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 3% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Mailup Wp-mailup
Published: 2013-03-22
Last modified: 2026-06-16

Description

ajax.functions.php in the MailUp plugin before 1.3.3 for WordPress does not properly restrict access to unspecified Ajax functions, which allows remote attackers to modify plugin settings and conduct cross-site scripting (XSS) attacks by setting the wordpress_logged_in cookie. NOTE: this is due to an incomplete fix for a similar issue that was fixed in 1.3.2.

Frequently asked questions

What is CVE-2013-0731?: ajax.functions.php in the MailUp plugin before 1.3.3 for WordPress does not properly restrict access to unspecified Ajax functions, which allows remote attackers to modify plugin settings and conduct cross-site scripting (XSS) attacks by setting the wordpress_logged_in cookie. NOTE: this is due to an incomplete fix for a similar issue that was fixed in 1.3.2.
How severe is CVE-2013-0731?: CVE-2013-0731 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2013-0731 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2013-0731?: CVE-2013-0731 primarily affects Mailup Wp-mailup. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2013-0731?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2013-0731 published?: CVE-2013-0731 was published on 2013-03-22 and last updated on 2026-06-16.

References

Affected products (10)

cpe:2.3:a:mailup:wp-mailup:*:*:*:*:*:*:*:*
cpe:2.3:a:mailup:wp-mailup:1.0.0:*:*:*:*:*:*:*
cpe:2.3:a:mailup:wp-mailup:1.1.0:*:*:*:*:*:*:*
cpe:2.3:a:mailup:wp-mailup:1.1.1:*:*:*:*:*:*:*
cpe:2.3:a:mailup:wp-mailup:1.1.2:*:*:*:*:*:*:*
cpe:2.3:a:mailup:wp-mailup:1.1.3:*:*:*:*:*:*:*
cpe:2.3:a:mailup:wp-mailup:1.2:*:*:*:*:*:*:*
cpe:2.3:a:mailup:wp-mailup:1.3:*:*:*:*:*:*:*
cpe:2.3:a:mailup:wp-mailup:1.3.1:*:*:*:*:*:*:*
cpe:2.3:a:mailup:wp-mailup:1.21:*:*:*:*:*:*:*

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