How severe is CVE-2023-26562?

CVE-2023-26562 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2023-26562 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-26562?

CVE-2023-26562 primarily affects Zimbra Collaboration. In total, 67 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-26562?

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

Does CVE-2023-26562 have an EU (EUVD) identifier?

Yes. CVE-2023-26562 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-30357.

When was CVE-2023-26562 published?

CVE-2023-26562 was published on 2024-02-13 and last updated on 2026-06-17.

CVE-2023-26562

CVE-2023-26562 is a medium-severity vulnerability in Zimbra Collaboration with a CVSS 3.x base score of 6.5. 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-862.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-30357
Weakness: CWE-862
Affected product: Zimbra Collaboration
Published: 2024-02-13
Last modified: 2026-06-17

Description

In Zimbra Collaboration (ZCS) 8.8.15 and 9.0, a closed account (with 2FA and generated passwords) can send e-mail messages when configured for Imap/smtp.

Frequently asked questions

What is CVE-2023-26562?: In Zimbra Collaboration (ZCS) 8.8.15 and 9.0, a closed account (with 2FA and generated passwords) can send e-mail messages when configured for Imap/smtp.
How severe is CVE-2023-26562?: CVE-2023-26562 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2023-26562 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-26562?: CVE-2023-26562 primarily affects Zimbra Collaboration. In total, 67 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-26562?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2023-26562 have an EU (EUVD) identifier?: Yes. CVE-2023-26562 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-30357.
When was CVE-2023-26562 published?: CVE-2023-26562 was published on 2024-02-13 and last updated on 2026-06-17.

References

Affected products (67)

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:p36:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p4:*:*:*:*:*:*
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:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:8.8.15:p9:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:9.0.0:-:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:9.0.0:p0:*:*:*:*:*:*
cpe:2.3:a:zimbra:collaboration:9.0.0:p1:*:*:*:*:*:*

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