nextcloud / nextcloud/server

Error in web updater: "Possible CSRF attack. Connection will be closed."

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#25,311 13 comments 0 reactions 0 assignees View on GitHub

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0. Needs triage 27-feedback 28-feedback 29-feedback bug feature: install and update high regression
Dominant language
PHP
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Description

Error in web updater:

"Possible CSRF attack. Connection will be closed."

By commenting out lines 85-88 in OC_EventSource.php the updater works fine.

cc @rullzer

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Research direction

Inspect OC_EventSource.php around lines 85-88 and trace the web updater request that triggers the CSRF message. Reproduce the updater failure, determine why the check rejects this request, and verify that the updater completes without weakening CSRF protection.

Written by the indexing model from the issue text.

Assessment

Tech stack
php
Domain
backend, security
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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