How severe is CVE-2021-37403?

CVE-2021-37403 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-2021-37403 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-37403?

CVE-2021-37403 primarily affects Open-xchange Open-xchange Appsuite. In total, 56 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-37403?

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

When was CVE-2021-37403 published?

CVE-2021-37403 was published on 2021-07-22 and last updated on 2026-06-17.

CVE-2021-37403

CVE-2021-37403 is a medium-severity vulnerability in Open-xchange Open-xchange Appsuite 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)
CVSS v2: 4.3
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Open-xchange Open-xchange Appsuite
Published: 2021-07-22
Last modified: 2026-06-17

Description

OX App Suite before 7.10.3-rev32 and 7.10.4 before 7.10.4-rev18 allows XSS via a code snippet (user-generated content) when a sharing link is created and an App Loader relative URL is used.

Frequently asked questions

What is CVE-2021-37403?: OX App Suite before 7.10.3-rev32 and 7.10.4 before 7.10.4-rev18 allows XSS via a code snippet (user-generated content) when a sharing link is created and an App Loader relative URL is used.
How severe is CVE-2021-37403?: CVE-2021-37403 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-2021-37403 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-37403?: CVE-2021-37403 primarily affects Open-xchange Open-xchange Appsuite. In total, 56 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-37403?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-37403 published?: CVE-2021-37403 was published on 2021-07-22 and last updated on 2026-06-17.

References

Affected products (56)

cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:-:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:patch_release5547:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:patch_release5572:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:patch_release5623:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:patch_release5653:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:patch_release5677:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:patch_release5720:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev1:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev10:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev11:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev12:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev13:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev14:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev15:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev16:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev17:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev18:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev19:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev2:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev20:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev21:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev22:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev23:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev24:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev25:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev26:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev27:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev28:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev29:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev3:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev30:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev31:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev4:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev5:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev6:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev7:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev8:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.3:rev9:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.4:-:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite:7.10.4:rev1:*:*:*:*:*:*

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