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CVE-2020-8293

A missing input validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows users to...

6.5 MediumFix available

A missing input validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows users to store unlimited data in workflow rules causing load and potential DDoS on later interactions and usage with those rules.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

1.58%Up 1.0 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 6.5

A missing input validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows users to store unlimited data in workflow rules causing load and potential DDoS on later interactions and usage with those rules.

Record
CVE-2020-8293
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
4.0 MediumAV:N/AC:L/Au:S/C:N/I:N/A:P
Weakness
CWE-400
Updated
2026-11-02
CVE List No score

A missing input validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows users to store unlimited data in workflow rules causing load and potential DDoS on later interactions and usage with those rules.

Record
CVE-2020-8293
Weakness
CWE-400
Updated
2026-11-02
EUVDEUVD-2020-29161 No score

A missing input validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows users to store unlimited data in workflow rules causing load and potential DDoS on later interactions and usage with those rules.

Record
EUVD-2020-29161
Updated
2026-11-03
GitHub AdvisoriesGHSA-g8q5-cq4v-2qq7 6.5

A missing input validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows users to...

A missing input validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows users to store unlimited data in workflow rules causing load and potential DDoS on later interactions and usage with those rules.

Record
GHSA-g8q5-cq4v-2qq7
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-400
Updated
2026-11-02
OSV 6.5

A missing input validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows users to store unlimited data in workflow rules causing load and potential DDoS on later interactions and usage with those rules.

Record
CVE-2020-8293
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVopenSUSE-SU-2021:0262-1 No score

Security update for nextcloud

This update for nextcloud fixes the following issues:

  • nextcloud was upgraded to version 20.0.7
    • CVE-2020-8294: Fixed a missing link validation (boo#1181803)
    • CVE-2020-8295: Fixed a denial of service attack (boo#1181804)
    • CVE-2020-8293: Fixed an input validation issue (boo#1181445)
Record
openSUSE-SU-2021:0262-1
Updated
2026-11-02
OSVopenSUSE-SU-2021:0274-1 No score

Security update for nextcloud

This update for nextcloud fixes the following issues:

  • nextcloud was upgraded to version 20.0.7
    • CVE-2020-8294: Fixed a missing link validation (boo#1181803)
    • CVE-2020-8295: Fixed a denial of service attack (boo#1181804)
    • CVE-2020-8293: Fixed an input validation issue (boo#1181445)

This update was imported from the openSUSE:Leap:15.2:Update update project.

Record
openSUSE-SU-2021:0274-1
Updated
2026-11-02
OSVopenSUSE-SU-2021:1068-1 No score

Security update for nextcloud

This update for nextcloud fixes the following issues:

nextcloud was updated to 20.0.11:

  • Fix boo#1188247 - CVE-2021-32678: OCS API response ratelimits are not applied
  • Fix boo#1188248 - CVE-2021-32679: filenames where not escaped by default in controllers using DownloadResponse
  • Fix boo#1188249 - CVE-2021-32680: share expiration date wasn't properly logged
  • Fix boo#1188250 - CVE-2021-32688: lacking permission check with application specific tokens
  • Fix boo#1188251 - CVE-2021-32703: lack of ratelimiting on the shareinfo endpoint
  • Fix boo#1188252 - CVE-2021-32705: lack of ratelimiting on the public DAV endpoint
  • Fix boo#1188253 - CVE-2021-32725: default share permissions were not being respected for federated reshares of files and folders
  • Fix boo#1188254 - CVE-2021-32726: webauthn tokens were not deleted after a user has been deleted
  • Fix boo#1188255 - CVE-2021-32734: possible full path disclosure on shared files
  • Fix boo#1188256 - CVE-2021-32741: lack of ratelimiting on the public share link mount endpoint
  • Bump handlebars from 4.7.6 to 4.7.7 (server#26900)
  • Bump lodash from 4.17.20 to 4.17.21 (server#26909)
  • Bump hosted-git-info from 2.8.8 to 2.8.9 (server#26920)
  • Don't break OCC if an app is breaking in it's Application class (server#26954)
  • Add bruteforce protection to the shareinfo endpoint (server#26956)
  • Ignore readonly flag for directories (server#26965)
  • Throttle MountPublicLinkController when share is not found (server#26971)
  • Respect default share permissions for federated reshares (server#27001)
  • Harden apptoken check (server#27014)
  • Use parent wrapper to properly handle moves on the same source/target storage (server#27016)
  • Fix error when using CORS with no auth credentials (server#27027)
  • Fix return value of getStorageInfo when 'quota_include_external_storage' is enabled (server#27108)
  • Bump patch dependencies (server#27183)
  • Use noreply@ as email address for share emails (server#27209)
  • Bump p-queue from 6.6.1 to 6.6.2 (server#27226)
  • Bump browserslist from 4.14.0 to 4.16.6 (server#27247)
  • Bump webpack from 4.44.1 to 4.44.2 (server#27297)
  • Properly use limit and offset for search in Jail wrapper (server#27308)
  • Make user:report command scale (server#27319)
  • Properly log expiration date removal in audit log (server#27325)
  • Propagate throttling on OCS response (server#27337)
  • Set umask before operations that create local files (server#27349)
  • Escape filename in Content-Disposition (server#27360)
  • Don't update statuses to offline again and again (server#27412)
  • Header must contain a colon (server#27456)
  • Activate constraint check for oracle / pqsql also for 20 (server#27523)
  • Only allow removing existing shares that would not be allowed due to reshare restrictions (server#27552)
  • Bump ws from 7.3.1 to 7.5.0 (server#27570)
  • Properly cleanup entries of WebAuthn on user deletion (server#27596)
  • Throttle on public DAV endpoint (server#27617)
  • Bump vue-loader from 15.9.3 to 15.9.7 (server#27639)
  • Bump eslint-plugin-standard from 4.0.1 to 4.0.2 (server#27651)
  • Validate the theming color also on CLI (server#27680)
  • Downstream encryption:fix-encrypted-version for repairing bad signature errors (server#27728)
  • Remove encodeURI code (files_pdfviewer#396)
  • Only ask for permissions on HTTPS (notifications#998)
  • Fix sorting if one of the file name is only composed with number (photos#785)
  • Backport 20 fix Photos not shown in large browser windows #630 (#686) (photos#810)
  • Update File.vue (photos#813)
  • Update chart.js (serverinfo#309)
  • Only return workspace property for top node in a propfind request (text#1611)
  • ViewerComponent: pass on autofocus to EditorWrapper (text#1647)
  • Use text/plain as content type for fetching the document (text#1692)
  • Log exceptions that happen on unknown exception and return generic messages (text#1698)
  • Add fixup (viewer#924)
  • Fix: fullscreen for Firefox (viewer#929)

Update to 20.0.7

  • Catch NotFoundException when querying quota…
Record
openSUSE-SU-2021:1068-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
nextcloud
openSUSE:Leap 15.2
before 20.0.7-lp152.3.6.1
20.0.7-lp152.3.6.1
nextcloud
SUSE:Package Hub 15 SP2
before 20.0.7-bp152.2.6.1
20.0.7-bp152.2.6.1
nextcloud
SUSE:Package Hub 12
before 20.0.11-bp153.2.3.1
20.0.11-bp153.2.3.1
nextcloud
SUSE:Package Hub 15 SP1
before 20.0.11-bp153.2.3.1
20.0.11-bp153.2.3.1
nextcloud
SUSE:Package Hub 15 SP2
before 20.0.11-bp153.2.3.1
20.0.11-bp153.2.3.1
nextcloud
SUSE:Package Hub 15 SP3
before 20.0.11-bp153.2.3.1
20.0.11-bp153.2.3.1
nextcloud
openSUSE:Leap 15.2
before 20.0.11-bp153.2.3.1
20.0.11-bp153.2.3.1
nextcloud
openSUSE:Leap 15.3
before 20.0.11-bp153.2.3.1
20.0.11-bp153.2.3.1

History

History
RecordedChangedSources
aliases, productsEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

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

In short

CVE-2020-8293 is a medium vulnerability (CVSS 6.5) in Hackerone Nextcloud Server, published January 26, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.58%, the 75th percentile. Fixed in nextcloud 20.0.7-lp152.3.6.1.

References

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