How severe is CVE-2023-43103?

CVE-2023-43103 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2023-43103 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-43103?

CVE-2023-43103 primarily affects Zimbra Collaboration. In total, 72 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-43103?

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

When was CVE-2023-43103 published?

CVE-2023-43103 was published on 2023-12-07 and last updated on 2026-06-17.

CVE-2023-43103

CVE-2023-43103 is a medium-severity vulnerability in Zimbra Collaboration with a CVSS 3.x base score of 6.1. 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 3.x base score 6.1)
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Zimbra Collaboration
Published: 2023-12-07
Last modified: 2026-06-17

Description

An XSS issue was discovered in a web endpoint in Zimbra Collaboration (ZCS) before 10.0.4 via an unsanitized parameter. This is also fixed in 8.8.15 Patch 43 and 9.0.0 Patch 36.

Frequently asked questions

What is CVE-2023-43103?: An XSS issue was discovered in a web endpoint in Zimbra Collaboration (ZCS) before 10.0.4 via an unsanitized parameter. This is also fixed in 8.8.15 Patch 43 and 9.0.0 Patch 36.
How severe is CVE-2023-43103?: CVE-2023-43103 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2023-43103 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-43103?: CVE-2023-43103 primarily affects Zimbra Collaboration. In total, 72 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-43103?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-43103 published?: CVE-2023-43103 was published on 2023-12-07 and last updated on 2026-06-17.

References

Affected products (72)

cpe:2.3:a:zimbra:collaboration:*:*:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:-:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p1:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p10:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p11:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p12:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p13:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p14:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p15:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p16:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p17:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p18:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p19:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p2:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p20:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p21:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p22:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p23:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p24:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p25:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p26:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p27:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p28:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p29:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p3:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p30:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p31:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p32:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p33:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p34:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p35:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p37:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p4:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p40:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p41:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p42:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p5:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p6:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p7:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p8:*:*:*:*:*:*

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