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CVE-2021-21376

Information Exposure in OMERO.web

6.4 MediumFix available

OMERO.web is open source Django-based software for managing microscopy imaging. OMERO.web before version 5.9.0 loads various information about the current user such as their id, name and the groups they are in, and these are available on the main webclient pages. This represents an information exposure vulnerability. Some additional information being loaded is not used by the webclient and is being removed in this release. This is fixed in version 5.9.0.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
Low
User interaction
Required

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
None

Exploit likelihood

1.46%Up 0.1 points since Apr 14, 2021
90%50%10%1%

What each source reports

CVE List Score used 6.4

Information Exposure in OMERO.web

OMERO.web is open source Django-based software for managing microscopy imaging. OMERO.web before version 5.9.0 loads various information about the current user such as their id, name and the groups they are in, and these are available on the main webclient pages. This represents an information exposure vulnerability. Some additional information being loaded is not used by the webclient and is being removed in this release. This is fixed in version 5.9.0.

Record
CVE-2021-21376
CVSS 3.1
6.4 MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
Weakness
CWE-200
Updated
2026-11-02
EUVDEUVD-2021-0157 6.4

OMERO.web is open source Django-based software for managing microscopy imaging. OMERO.web before version 5.9.0 loads various information about the current user such as their id, name and the groups they are in, and these are available on the main webclient pages. This represents an information exposure vulnerability. Some additional information being loaded is not used by the webclient and is being removed in this release. This is fixed in version 5.9.0.

Record
EUVD-2021-0157
CVSS 3.1
6.4 MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
Updated
2026-11-03
GitHub AdvisoriesGHSA-gfp2-w5jm-955q 7.4

OMERO.web exposes some unnecessary session information in the page

Background

OMERO.web loads various information about the current user such as their id, name and the groups they are in, and these are available on the main webclient pages. Some additional information being loaded is not used by the webclient and is being removed in this release.

Impact

OMERO.web before 5.9.0

Patches

5.9.0

Workarounds

No workaround

References

For more information

If you have any questions or comments about this advisory:

Record
GHSA-gfp2-w5jm-955q
CVSS 4.0
7.4 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
6.4 MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
Weakness
CWE-200
Updated
2026-11-02
NVD 6.4

OMERO.web is open source Django-based software for managing microscopy imaging. OMERO.web before version 5.9.0 loads various information about the current user such as their id, name and the groups they are in, and these are available on the main webclient pages. This represents an information exposure vulnerability. Some additional information being loaded is not used by the webclient and is being removed in this release. This is fixed in version 5.9.0.

Record
CVE-2021-21376
CVSS 3.1
6.4 MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:P/I:N/A:N
Weakness
CWE-200
Updated
2026-11-02
OSV 6.5

OMERO.web is open source Django-based software for managing microscopy imaging. OMERO.web before version 5.9.0 loads various information about the current user such as their id, name and the groups they are in, and these are available on the main webclient pages. This represents an information exposure vulnerability. Some additional information being loaded is not used by the webclient and is being removed in this release. This is fixed in version 5.9.0.

Record
CVE-2021-21376
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVGHSA-gfp2-w5jm-955q 7.4

OMERO.web exposes some unnecessary session information in the page

Background

OMERO.web loads various information about the current user such as their id, name and the groups they are in, and these are available on the main webclient pages. Some additional information being loaded is not used by the webclient and is being removed in this release.

Impact

OMERO.web before 5.9.0

Patches

5.9.0

Workarounds

No workaround

References

For more information

If you have any questions or comments about this advisory:

Record
GHSA-gfp2-w5jm-955q
CVSS 4.0
7.4 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
6.4 MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
Weakness
CWE-200
Updated
2026-11-02
OSVPYSEC-2021-31 No score

OMERO.web is open source Django-based software for managing microscopy imaging. OMERO.web before version 5.9.0 loads various information about the current user such as their id, name and the groups they are in, and these are available on the main webclient pages. This represents an information exposure vulnerability. Some additional information being loaded is not used by the webclient and is being removed in this release. This is fixed in version 5.9.0.

Record
PYSEC-2021-31
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
omero-web
PyPI
 before 5.9.0
5.9.0
omero-web
PyPI
 before 5.9.0, plus listed versions
5.5.dev15.5.dev25.6.05.6.15.6.2
Show 12 moreShow less
5.6.35.6.dev15.6.dev25.6.dev35.6.dev45.6.dev55.6.dev65.6.dev75.7.05.7.15.8.05.8.1
5.9.0
omero-web
PyPI
 before 5.9.0, plus listed versions
5.5.dev15.5.dev25.6.dev15.6.dev25.6.dev3
Show 12 moreShow less
5.6.dev45.6.dev55.6.dev65.6.dev75.6.05.6.15.6.25.6.35.7.05.7.15.8.05.8.1
5.9.0

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-21376 is a medium vulnerability (CVSS 6.4) in Openmicroscopy Omero.web, published March 23, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.46%, the 73rd percentile. Fixed in omero-web 5.9.0.

References

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