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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-43287] Prevent $merge from outputting to system collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-43287</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;$out has a check to disallow writing to system collections which I think should be added to $merge. &lt;/p&gt;

&lt;p&gt;Also to consider, I don&apos;t know of any restrictions on which database you can write to. We may wish to disallow writing to &quot;admin&quot;, &quot;config&quot;, and &quot;local&quot; as well.&lt;/p&gt;

&lt;p&gt;If we don&apos;t change anything, we need more tests at the very least.&lt;/p&gt;</description>
                <environment></environment>
        <key id="923647">SERVER-43287</key>
            <summary>Prevent $merge from outputting to system collections</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="mihai.andrei@mongodb.com">Mihai Andrei</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Wed, 11 Sep 2019 17:36:57 +0000</created>
                <updated>Sun, 29 Oct 2023 22:17:16 +0000</updated>
                            <resolved>Mon, 21 Oct 2019 13:58:50 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2501921" author="shane.harvey" created="Fri, 25 Oct 2019 22:47:09 +0000"  >&lt;p&gt;Note that this is a minor breaking change since it&apos;s no longer possible to use $currentOp and $listLocalSessions with $out. This caused the test failure it &lt;a href=&quot;https://jira.mongodb.org/browse/PYTHON-2023&quot; title=&quot;Test failure - test.test_database.TestDatabaseAggregation.test_database_aggregation_fake_cursor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;PYTHON-2023&quot;&gt;&lt;del&gt;PYTHON-2023&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="2492467" author="xgen-internal-githook" created="Mon, 21 Oct 2019 13:56:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mihai Andrei&apos;, &apos;email&apos;: &apos;mihai.andrei@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43287&quot; title=&quot;Prevent $merge from outputting to system collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43287&quot;&gt;&lt;del&gt;SERVER-43287&lt;/del&gt;&lt;/a&gt; Prevent  from outputting to system collections&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0d740a44335d3835ad0e947115c6fc8cf5e2122f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0d740a44335d3835ad0e947115c6fc8cf5e2122f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2416844" author="charlie.swanson" created="Wed, 11 Sep 2019 17:41:31 +0000"  >&lt;p&gt;Started working on this as part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43020&quot; title=&quot;New mapReduce -&amp;gt; agg path on mongos fails to validate that namespace element is a string&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43020&quot;&gt;&lt;del&gt;SERVER-43020&lt;/del&gt;&lt;/a&gt; but decided it was worth it&apos;s own ticket and triage. Attached  &lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/230513/230513_WIP.patch&quot; title=&quot;WIP.patch attached to SERVER-43287&quot;&gt;WIP.patch&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt; which is as far as I got.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10520">
                    <name>Problem/Incident</name>
                                            <outwardlinks description="causes">
                                        <issuelink>
            <issuekey id="979570">PYTHON-2023</issuekey>
        </issuelink>
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                                                        </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
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            <issuekey id="905176">SERVER-43020</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="923645">SERVER-43286</issuekey>
        </issuelink>
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                            <attachment id="230513" name="WIP.patch" size="4144" author="charlie.swanson@mongodb.com" created="Wed, 11 Sep 2019 17:40:52 +0000"/>
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