How severe is CVE-2010-3921?

CVE-2010-3921 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2010-3921 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2010-3921?

CVE-2010-3921 primarily affects Sixapart Movabletype. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2010-3921?

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

When was CVE-2010-3921 published?

CVE-2010-3921 was published on 2010-12-09 and last updated on 2026-06-16.

CVE-2010-3921

CVE-2010-3921 is a medium-severity vulnerability in Sixapart Movabletype with a CVSS 2.0 base score of 4.3. 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-79.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Sixapart Movabletype
Published: 2010-12-09
Last modified: 2026-06-16

Description

Cross-site scripting (XSS) vulnerability in Movable Type 4.x before 4.35 and 5.x before 5.04 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.

Frequently asked questions

What is CVE-2010-3921?: Cross-site scripting (XSS) vulnerability in Movable Type 4.x before 4.35 and 5.x before 5.04 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
How severe is CVE-2010-3921?: CVE-2010-3921 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2010-3921 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2010-3921?: CVE-2010-3921 primarily affects Sixapart Movabletype. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2010-3921?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2010-3921 published?: CVE-2010-3921 was published on 2010-12-09 and last updated on 2026-06-16.

References

Affected products (17)

cpe:2.3:a:sixapart:movabletype:4.0:*:*:*:*:*:*:*
cpe:2.3:a:sixapart:movabletype:4.1:*:*:*:*:*:*:*
cpe:2.3:a:sixapart:movabletype:4.2:*:*:*:*:*:*:*
cpe:2.3:a:sixapart:movabletype:4.3:*:*:*:*:*:*:*
cpe:2.3:a:sixapart:movabletype:4.23:*:*:*:*:*:*:*
cpe:2.3:a:sixapart:movabletype:4.25:*:*:*:*:*:*:*
cpe:2.3:a:sixapart:movabletype:4.26:*:*:*:*:*:*:*
cpe:2.3:a:sixapart:movabletype:4.31:*:*:*:*:*:*:*
cpe:2.3:a:sixapart:movabletype:4.32:*:*:*:*:*:*:*
cpe:2.3:a:sixapart:movabletype:4.33:*:*:*:*:*:*:*
cpe:2.3:a:sixapart:movabletype:4.34:*:*:*:*:*:*:*
cpe:2.3:a:sixapart:movabletype:4.261:*:*:*:*:*:*:*
cpe:2.3:a:sixapart:movabletype:5.0:rc2:*:*:*:*:*:*
cpe:2.3:a:sixapart:movabletype:5.01:*:*:*:*:*:*:*
cpe:2.3:a:sixapart:movabletype:5.02:*:*:*:*:*:*:*
cpe:2.3:a:sixapart:movabletype:5.03:*:*:*:*:*:*:*
cpe:2.3:a:sixapart:movabletype:5.031:*:*:*:*:*:*:*

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